Harrow with cleaning attachment



G. BORSTAD.

HARROW WITH CLEANING ATTACHMENT.

APPLICATION FILED MAY 8, 1920.

1,373,946, Patented Apr. 5,1921

2 SHEETS-SHEET row is in motion or use.

UNITED; sures erLBEn'r 30mm); or sTARBUoK, rNnEsoTA.

' HARROW' wri'n CLEANING ATTAcn'MENr.

Specification bf Letters Page. r

Patented Apr. 5, 19,2 1.

Application filed m 8, 1920. Serial No. 379,820.

T 0 all 10 ho'm it may COW/067%" Be it known that I, Gunner BORSTAD, acitizen of the United States, residin at Starbuck, in the county of Popeand tate of Minnesota, have invented a new and useful Harrow withCleaning Attachment,.of which the following is a specification.

My invention relates to harrows or drags having means by which toreadily clean their teeth of weedsand roots while the har- The implementmay be used as a pulverizer of the soil and at the same time as a dragfor cleaning the soil of quack-grass and other weeds and rubbish, or foreither of said purposes.

In the accompanying drawing:

Figure 1 is a plan view of the improved implement, showing how it maypreferably be made infour sections drawn by a single evener bar havingdraft appliances'for several horses. Fig. 2 is a plan viewo-f one of thesections on an enlarged scale. Fig. 3 is a partly sectional detail viewof one of; the rock shafts 37 in Fig. 2. Fig. 4 is a left hand end viewof the shaft in Fig. 3 with: the nut 53 and outer arm 36 removed. Fig. 5is a right hand end view of theshaft in Fig.3 with nut, lever andbearing omitted. Fig. 6 is a partly sectional detail view of the inwardend of either one of the two rock shafts 38, in Fig. 2. Fig. 7 is aright hand end view of the shaft in Fig. 6. Fig. 8 is a detail view of apart of one of several rocker arms fixed on rock shaft. Fig. 9 is anelevation of the lower edge of Fig. 2, but represents also a section online 9-9 in Fig. 2. Figs. 10, 11, and 12 are sections respectively onthe lines 10, 11 and 12 in Fig. 2. Fig. 13 is an elevation of theoperating lever and some adjacent partslooking as from right to left inFig. 12.

Referring to the drawings by reference numerals, 15 in Fig. 1 designatesdraft appli-' ances attached to an evener bar 16, to which severalharrow sections 17 may be attached by clevises 18, as shown in Fig.1;'but as the scale in said view is too small for showing the inventionclearly, one of the harrow sections is enlarged in Fig. 2 and "otherviews, where it will be seen that each section 1sv in a way anindependent harrow and 1s composed of a serles of parallel frame bars 19and bracing bars 20. Secured in the bars 19 are regular harrow teeth 21,preferably of rectangular cross section and arranged to be drawn withone corner forward. The

positions that when the section is drawn'in a direction at right anglesto its front edge the teeth will move in parallel lines only a fewinches apart. Y

Arranged to be moved in vertical directions aboutthe teeth so as toclean them,

is a skeleton frame composed of several longitudinal metal bars 22,which are seteeth are also arranged in such alternate cured together inpairs with rivets 23 and spacing tubes 24 (see Fig. 10 and lower bar ofFig. 2,) so as to retain one bar of each pair near each side'of aro-w ofthe harrow teeth. Said pairs of bars have their ends securedtogether bya'front cross bar 25 and a rear cross bar 26. To each of said cross barsis secured at 27 afgrooved or channeled plate form'inga kind'o'frunneror guide28, which enablesthe skeletonframe to glide over slightobstructions, especially over the weeds accumulated by the harrow teeth,when the teeth are to pass overthe same.

The skeleton frame" or cleaning attach ment thus formed is connectedto-theharrow frame by inclined links 29-'which prevent too much rearwarddisplacement of the attachment when it is in contact withthe ground. Thedownward displacement is limited by an almost verticalrod 30 -(see Figs.2 and 11) having its lower end pivoted at 31 to the attachment and isextended loosely upward through a bracket 32 fixedon the frame '19., andthreaded and provided with a nut 33 and a jamnut 3& above the 'bracket,said nuts serving to regulate and of the rod stop the downward -movementand the attachment. i

The cleaning attachment is raised and lowered by links 35, from rockerarms 36,. fixed on rocker-shafts 37 and 38. Said shafts are rocked byrocking arms 39, which are connected by links-4:1, 512;413; and the arm44) is a part of a handlever 414., having 7 a handle 45 with a fingerlever 4C6 operating a dog 4-7, which is arranged to engage in a notch#18 of asegmental bracket {19 fixed on V the main frame.

In the operation ofthe harrow, dog is in said notch the attachment 22 iswhen the dog is disengaged and the lever when the i held close up underthe harrow'frame and V move downward as in Fig;v llandethereby raise theframe and-cause the accumulated weeds and roots to escape edownwardlybelow the teeth} and when the teeth'have passed over the same the lever44 is swung rearwardly again and the dog engaged 1n the notch, thusallowing the harrow to sink its teeth into the ground as soon as it haspassed over the place where it was lifted out of the ground and thegathered weeds. The rocker arms and shafts are very cheaply but stronglymade and put together, preferably in the following manner. Each arm ischeaply made from fiat bar iron and has punched in it an oblong hole 50(see Fig. 8) adapted to fit a flattened portion '51 ofthe shaft and beheld tightly against shoulders 52 either directly by a screw nut 53, asat the rocking arm 39 to the right in Fig. 3, or indirectly by the nutand by a bushing 54 filling between two rocked arms 36, as to the leftin Fig. 3. In the latter instance the bushing is firmly held bythe armsand is placed in the hearing 57 of the shaft, thus enabling the one nut53 to hold the two arms. 36 spaced apart one at each side of thehearing.

In Fig. 6, where only one arm, 39, is to be secured on the shaft,andthat near the inner end of the bearing 57, the bush rng 54 isthreaded upon a reduced portion 58 of the shaft and screwed against thearm 39, which is thereby firmly held upon the fiat portion 51 andagainst the shoulder 52 of the shaft. This method enables the hearing tohe slipped off from the shaft whenever so required without disturbingthe fixed condition ofv the arm on the shaft. In Fig. 10, keys 59indicate that the arms may be secured by any suitable means.

From the description thus given it will be seen that the implement willin one operation harrow and pulverize the soil and also clean the weeds,roots and other undesirableistuff out of the soil, and leave them incertain places on the field so they can be further removed by anysuitable means.

What I claim is,

1. In a harrow, a series of teeth and a tooth cleaning attachmentmovable up and down on the teeth, means for moving the at- .tachment,and means for regulating and limiting the downward movement of the attachment.

2. In a harrow cleaning attachment, a rock shaft having an end portionflattened at two sides, producing two shoulders, a rocker arm withanoblonghole fitting the flattened end and a nutthreaded (upon the endof the shaft and holding the rocker arm against said shoulders.

3. In a harrow cleaning attachment a rock shaft. having one endflattened at two opposite sideswith a shoulder at theend of each fiatside,'a nut threaded upon-the end of the shaft, two rocker armshavingoblong holes fitting the fiat portion of the shaft, a

bushing interposed between the rocker arms to space them apart and oneof them against the shoulders when the nut is drawn tight against theother one;

4:. The structure specified in claim- 3, and" a journal bearingembracing the bushing to support the shaft.

. In testimony whereof I aflix my signature.

GILBERT BoRsTAD.

